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The Precision Array for Probing the Epoch of Reionization (PAPER) is a low-frequency radio interferometer designed to detect the ignition of the first stars and galaxies around 500 Million years after the Big Bang.
It uses intensity mapping of 21cm emission of neutral hydrogen at high redshifts (z=7-12) to measure the power spectrum of fluctuations in the intergalactic medium introduced by the first luminous sources in the universe.
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